diff --git a/activesupport/lib/active_support/core_ext/enumerable.rb b/activesupport/lib/active_support/core_ext/enumerable.rb
index 15a303cf046cfdd9037d2bebff8499e5a2b56978..b11c916f619308118cbb203c48106c66f55f04ee 100644
--- a/activesupport/lib/active_support/core_ext/enumerable.rb
+++ b/activesupport/lib/active_support/core_ext/enumerable.rb
@@ -101,15 +101,6 @@ def many?(&block)
     size = block_given? ? select(&block).size : self.size
     size > 1
   end
-
-  # Returns true if none of the elements match the given block.
-  #
-  #   success = responses.none? {|r| r.status / 100 == 5 }
-  #
-  # This is a builtin method in Ruby 1.8.7 and later.
-  def none?(&block)
-    !any?(&block)
-  end unless [].respond_to?(:none?)
 end
 
 class Range #:nodoc:
diff --git a/activesupport/test/core_ext/enumerable_test.rb b/activesupport/test/core_ext/enumerable_test.rb
index a8e98891d330a0af29b26b2143e4e24d91dff68a..66f5f9fbdec5a3b6c99bdafd5e32eb88d43f4572 100644
--- a/activesupport/test/core_ext/enumerable_test.rb
+++ b/activesupport/test/core_ext/enumerable_test.rb
@@ -89,15 +89,4 @@ def test_many
     assert ![ 1, 2 ].many? {|x| x > 1 }
     assert [ 1, 2, 2 ].many? {|x| x > 1 }
   end
-
-  def test_none
-    assert [].none?
-    assert [nil, false].none?
-    assert ![1].none?
-
-    assert [].none? {|x| x > 1 }
-    assert ![ 2 ].none? {|x| x > 1 }
-    assert ![ 1, 2 ].none? {|x| x > 1 }
-    assert [ 1, 1 ].none? {|x| x > 1 }
-  end
 end